Leading a force of ravenous and destructive creatures from below the soil, Hammerklak is considered a leader of a group referred to, for obvious reasons, as Subterrans. Resembling moles in aspect and methodology, yet utterly brutal and with no regard for the natural world, Hammerklak has proven to be a menace as great as Rogzor or Gorghadra. Able to tunnel with unnatural alacrity and emerging to destroy his foes, Hammerklak has a fierce temper, and few can withstand his drills during his berserk rages.